qiuz 4 ps spring 2014 power system
DESCRIPTION
Power system quizTRANSCRIPT
ONE-HOUR TEST # 1 : (Date:06-06-06)
Air University
Electrical Engg Deptt (Power System)
Quiz 4(EE ..)
Dr. FidaPage 1 of 1
Time : 10 Min
Marks : 10
Date: 19.02.2014_
The per-unit quantity is always dimensionless. (a) True (ans)
(b) FalseWhy? Prove with equation:
To convert a per-unit impedance from old to new base values, the equation to be used is [ tick ( ] (b)= (ans)
For balanced three-phase systems, Zbase is given by (a) True(ans) (b) False
In the given system the base apparent power is 30kVA and zone-3 the base voltage is 120V. (a) Find the actual impedance value of 20kva transformer and its pu value in the new base system. (b) Find the per unit value of transformer in zone-1
(Fill in the Blanks) Positive-sequence components consist of three phasors with __________ magnitudes, and __________ phase displacement in positive sequence; and zero-sequence components consist of three phasors with __________ magnitudes, and __________ phase displacement.
[Matrix equation: Vp = AVs]: The sequence components V0, V1, and V2 can be expressed in terms of phase components Va, Vb, and Vc. V0 = __________________
V1 = __________________
V2 = __________________
In matrix A the value of a= and a3 ..
Without solving - find the sequence voltages of the given phase values.
Without solving - find the sequence current of the given phase values.Roll Number = section: A / B
Marks =